Revenue Recognition - General Information (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from Contract with Customer [Abstract]
Percentage of income outside of scope of ASC 606 (as a percent)	17.47%	28.63%	31.13%	28.50%

Noninterest Revenue Outside Scope of Accounting Standard Codification 606, Percentage

No definition available.

Name:	bsrr_NoninterestRevenueOutsideScopeOfAccountingStandardCodification606Percentage
Namespace Prefix:	bsrr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration